DeepL

High-accuracy AI translation for documents and text in 30+ language pairs

Lumo (Proton)

Privacy-first AI assistant from the makers of ProtonMail, with Swiss jurisdiction and zero-access encryption

DeepL

Excellent

25/25

Lumo (Proton)

Excellent

23/25

Score Breakdown

DimensionDeepLLumo (Proton)

Data Residency

Where is your data stored and processed?

DeepL: EU processing by default on AWS; explicit Data Residency add-on available for US and JP

Lumo (Proton): Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.

5/5

EU processing by default on AWS; explicit Data Residency add-on available for US and JP

5/5

Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.

Legal Jurisdiction

Which laws govern the company and your data?

DeepL: German company under EU law; strong GDPR alignment; BSI C5 attestation

Lumo (Proton): Swiss incorporation provides one of the strongest privacy jurisdictions globally. Outside US CLOUD Act reach. Swiss FADP and GDPR adequacy. Proton has a decade-long track record of defending user privacy.

5/5

German company under EU law; strong GDPR alignment; BSI C5 attestation

5/5

Swiss incorporation provides one of the strongest privacy jurisdictions globally. Outside US CLOUD Act reach. Swiss FADP and GDPR adequacy. Proton has a decade-long track record of defending user privacy.

Data Retention & Training

Is your data used for model training?

DeepL: Pro tier texts deleted immediately after translation; no use for AI training

Lumo (Proton): Zero-access encryption on conversations. User data explicitly never used for model training. Open-source code enables independent verification of privacy claims.

5/5

Pro tier texts deleted immediately after translation; no use for AI training

5/5

Zero-access encryption on conversations. User data explicitly never used for model training. Open-source code enables independent verification of privacy claims.

Certifications

ISO 27001, SOC 2, Cyber Essentials, etc.

DeepL: SOC 2 Type II, ISO 27001, BSI C5 Type 2, and HIPAA certified

Lumo (Proton): ISO 27001 and SOC 2 at Proton AG organisational level. Strong for a consumer-facing privacy product. ISO 27701 would further strengthen the posture.

5/5

SOC 2 Type II, ISO 27001, BSI C5 Type 2, and HIPAA certified

4/5

ISO 27001 and SOC 2 at Proton AG organisational level. Strong for a consumer-facing privacy product. ISO 27701 would further strengthen the posture.

Regulatory Fit

Suitability for regulated industries and professional services

DeepL: Excellent fit for EU-regulated industries including legal, pharma, and financial services

Lumo (Proton): Excellent fit for privacy-sensitive professionals in legal and financial services. Swiss jurisdiction, zero-access encryption, and no training on user data address key regulatory concerns. Not EU-incorporated but GDPR adequate.

5/5

Excellent fit for EU-regulated industries including legal, pharma, and financial services

4/5

Excellent fit for privacy-sensitive professionals in legal and financial services. Swiss jurisdiction, zero-access encryption, and no training on user data address key regulatory concerns. Not EU-incorporated but GDPR adequate.

Total Score

25/25

23/25

Best For

DeepL

Best for EU-headquartered organisations needing maximum data sovereignty; organisations requiring broad certification coverage (SOC 2 Type II, ISO 27001, BSI C5 Type 2); regulated industries (ICO, BaFin); privacy-conscious teams who need strong data retention controls; teams on a tight budget.

Lumo (Proton)

Best for EU-headquartered organisations needing maximum data sovereignty; regulated industries (legal, financial-services); privacy-conscious teams who need strong data retention controls; organisations that need self-hosted or on-premise deployment; teams on a tight budget.

Detailed Comparison

DeepL vs Lumo (Proton): Trust & Compliance Comparison

DeepL (DeepL SE, DE) scores 25/25 overall with a Gold (Excellent) trust badge. High-accuracy AI translation for documents and text in 30+ language pairs. Lumo (Proton) (Proton, CH) scores 23/25 with a Gold (Excellent) trust badge. Privacy-first AI assistant from the makers of ProtonMail, with Swiss jurisdiction and zero-access encryption.

Dimension-by-Dimension Breakdown

#### Data Residency

Both score equally at 5/5.

●DeepL (5/5): EU processing by default on AWS; explicit Data Residency add-on available for US and JP

●Lumo (Proton) (5/5): Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.

#### Legal Jurisdiction

Both score equally at 5/5.

●DeepL (5/5): German company under EU law; strong GDPR alignment; BSI C5 attestation

●Lumo (Proton) (5/5): Swiss incorporation provides one of the strongest privacy jurisdictions globally. Outside US CLOUD Act reach. Swiss FADP and GDPR adequacy. Proton has a decade-long track record of defending user privacy.

#### Data Retention & Training

Both score equally at 5/5.

●DeepL (5/5): Pro tier texts deleted immediately after translation; no use for AI training

●Lumo (Proton) (5/5): Zero-access encryption on conversations. User data explicitly never used for model training. Open-source code enables independent verification of privacy claims.

#### Certifications

DeepL leads with 5/5 vs 4/5.

●DeepL (5/5): SOC 2 Type II, ISO 27001, BSI C5 Type 2, and HIPAA certified

●Lumo (Proton) (4/5): ISO 27001 and SOC 2 at Proton AG organisational level. Strong for a consumer-facing privacy product. ISO 27701 would further strengthen the posture.

#### Regulatory Fit

DeepL leads with 5/5 vs 4/5.

●DeepL (5/5): Excellent fit for EU-regulated industries including legal, pharma, and financial services

●Lumo (Proton) (4/5): Excellent fit for privacy-sensitive professionals in legal and financial services. Swiss jurisdiction, zero-access encryption, and no training on user data address key regulatory concerns. Not EU-incorporated but GDPR adequate.

Certifications at a Glance

Certification	DeepL	Lumo (Proton)
BSI C5 Type 2	Yes	No
HIPAA	Yes	No
ISO 27001	Yes	Yes
SOC 2	No	Yes
SOC 2 Type II	Yes	No

Overall Verdict

DeepL has a clear trust advantage, scoring 25/25 compared to Lumo (Proton)'s 23/25. DeepL particularly excels in certifications, regulatory fit.

Frequently Asked Questions

Which is better for EU compliance, DeepL or Lumo (Proton)?

DeepL has a TrustKit score of 25/25 while Lumo (Proton) scores 23/25. DeepL currently rates higher across data residency, legal jurisdiction, data retention, certifications, and regulatory fit.

How do DeepL and Lumo (Proton) compare on data residency?

DeepL scores 5/5 for data residency (EU processing by default on AWS; explicit Data Residency add-on available for US and JP), while Lumo (Proton) scores 5/5 (Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.).

Are DeepL and Lumo (Proton) GDPR compliant?

Both tools are assessed across five compliance dimensions. DeepL has a regulatory fit score of 5/5 and Lumo (Proton) scores 4/5. Check the full comparison above for a detailed breakdown.

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